Base-solubilized acrylic polymers and aqueous resinous dispersions of acrylic polymers and epoxy resins
AssigneePPG Industries, Inc.
InventorsRoger M. Christenson, Rudolf Maska, Rostyslawa Dowbenko, Thomas R. Hockswender
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Abstract
An aqueous resinous dispersion and a method of coating employing the aqueous resinous dispersion are disclosed. The aqueous resinous dispersions are solubilized with base and comprise an acrylic polymer containing N-ethoxymethylacrylamide or methacrylamide moieties and an epoxy resin. The dispersion is useful for coating metal containers particularly as a coating for the interior of containers which are used for alcoholic beverages, for example, beer cans.
Claims20
An aqueous, base-solubilized resinous dispersion in which the resinous phase comprises:
- (A) 15 to 90 percent by weight of an acrylic polymer which is formed by solution polymerizing in the absence of primary and secondary alcohols other than ethanol, the following monomer charge:
- (1) 15 to 85 percent by weight of an alpha, beta-ethylenically unsaturated carboxylic acid,
- (2) 5 to 85 percent by weight of N-ethoxymethylacrylamide or N-ethoxymethylmethacrylamide,
- (3) 0 to 80 percent by weight of a copolymerizable vinyl monomer different from (1) and (2);
- the percentages by weight of (1), (2) and (3) being based on total weight of (1), (2) and (3);
- (B) 10 to 85 percent by weight of an epoxy resin;
- the percentages by weight of (A) and (B) being based on total weight of (A) and (B).
A base-solubilized acrylic polymer which is formed by solution polymerization in the absence of primary and secondary alcohols other than ethanol the following monomer charge:
- (1) 25 to 70 percent by weight of an alpha, beta-ethylenically unsaturated carboxylic acid;
- (2) 15 to 50 percent by weight of N-ethoxymethylacrylamide or N-ethoxymethylmethacrylamide, measured as acrylamide or methacrylamide, respectively;
- (3) 20 to 60 percent by weight of a copolymerizable alpha, beta-ethylenically unsaturated monomer or mixture of monomers different from (1) and (2);
- the percentage by weight of (1), (2) and (3) being based on total weight of (1), (2) and (3);
- said acrylic polymer being at least partially neutralized with a base.
A method for preparing an acrylic polymer comprising:
- (A) dissolving the following mixture of monomers in a solvent or a mixture of solvents which is free from primary and secondary alcoholic solvents other than ethanol:
- (1) 25 to 70 percent by weight of an alpha, beta-ethylenically unsaturated carboxylic acid,
- (2) 15 to 50 percent by weight of N-ethoxymethylacrylamide or N-ethoxymethylmethacrylamide measured as acrylamide or methacrylamide, respectively,
- (3) 20 to 60 percent by weight of a copolymerizable alpha, beta-ethylenically unsaturated monomer or a mixture of monomers different from (1) and (2);
- the percentage by weight of (1), (2) and (3) being based on total weight of (1), (2) and (3),
- (B) polymerizing the dissolved mixture of monomers in the presence of a free radical initiator until the free monomer content is below 0.5 percent.
Dependencies are inferred from the claim text.